TY - JOUR AU - S. A. Budochkina TI - Symmetries and first integrals of a second order evolutionary operator equation JO - Eurasian mathematical journal PY - 2012 SP - 18 EP - 28 VL - 3 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EMJ_2012_3_1_a1/ LA - en ID - EMJ_2012_3_1_a1 ER -